Ontario Air Brake (Z) Practice Test 8

All 25 questions in this test

Every question and its answer choices. The correct answers and explanations appear when you take the test above.

1. You apply the brakes and see a lining that does not touch the drum. What does it show?

   1. A brake with new linings
   2. A normal cold brake
   3. A malfunctioning brake
   4. A properly adjusted brake

2. Why must both brake chambers on a steering axle be the same size?

   1. The law sets one size per truck
   2. Different sizes cannot be bought
   3. Unequal force can affect steering
   4. Larger chambers use more air

3. What links the brake chamber pushrod to the brake assembly?

   1. The slack adjuster
   2. A one-way check valve on the axle
   3. A flexible rubber gladhand
   4. A clamp-type collar on the drum

4. What do air brake systems use to produce the force that applies the brakes?

   1. Brake fluid in a master cylinder
   2. Electric motors at each wheel
   3. Compressed air stored in tanks
   4. Vacuum from the engine intake

5. As speed or weight goes up, how must you use the brake pedal to get the same stop?

   1. Use the trailer hand valve instead
   2. Press it more lightly than usual
   3. Press it further
   4. Pump it rapidly several times

6. For a tractor-trailer, whose spring brakes is it preferable to test for holding?

   1. The converter dolly's
   2. None; only service brakes are tested
   3. The towing vehicle's
   4. The rear trailer's only

7. System pressure is 45 psi and you try to drive off. What is likely happening?

   1. The spring brakes are partly applied
   2. The governor is at cut-out
   3. The service brakes are locked on
   4. The trailer supply valve is open

8. What must a low air-pressure warning device always include?

   1. A visual warning such as a light
   2. A loud horn outside the cab
   3. An automatic engine shutdown
   4. A dropping arm on every truck

9. What is the adjustment limit for a type 30 long-stroke chamber with square ports?

   1. 3 in. (76 mm)
   2. 2-1/2 in. (64 mm)
   3. 2-1/4 in. (57 mm)
   4. 2 in. (51 mm)

10. When you release the brake pedal, what returns the pushrod into the chamber?

    1. The spring inside the chamber
    2. The weight of the slack adjuster
    3. Air from the secondary tank
    4. The governor at cut-in

11. Which three types of foundation brakes does the Ontario air brake handbook describe?

    1. Disc, cone and wedge
    2. S-cam, band and spring
    3. S-cam, disc and wedge
    4. Drum, band and cone

12. Where is the ABS warning lamp for a trailer usually mounted?

    1. Inside the trailer near the kingpin
    2. Under the trailer's rear bumper
    3. On the trailer's landing gear
    4. Where you can see it in the mirror

13. Which event makes trailer spring brakes apply automatically?

    1. The supply line breaks or comes off
    2. The service line is pressurized
    3. The hand valve is released
    4. The tractor reaches cut-out

14. After the renewal learning module, what do you bring to DriveTest?

    1. A brand-new medical report form only
    2. Completion certificate and licence
    3. Your last pushrod stroke measurements
    4. A letter from your current employer

15. Since September 1, 2023, what replaces the air brake knowledge test at renewal?

    1. An online air brake learning module
    2. A medical exam
    3. A video quiz at ServiceOntario
    4. A second practical test

16. How can you recognize a spring brake chamber compared with a service chamber?

    1. It has no pushrod coming out of it
    2. It is painted red by Ontario law
    3. It is mounted inside the brake drum
    4. It has an extra, larger spring section

17. Why is the rotor of an air disc brake only partly visible?

    1. The wheel, caliper and shields hide it
    2. It sits inside the air brake chamber
    3. It is sealed inside a separate brake drum
    4. It is mounted behind the vehicle's fuel tank

18. Your service brakes fail on the road. How can you use the spring brakes to stop?

    1. Use the spring brake control valve
    2. Open all the air tank drain valves
    3. Shut off the engine to drop the air
    4. Pull the trailer hand valve fully on

19. In a drum brake, how do the brake shoes stop the wheel?

    1. They push inward on the hub
    2. They squeeze a band around the axle
    3. They clamp both sides of a rotor
    4. They press outward against the drum

20. Which governor result makes the air brake system defective?

    1. Cut-in below 80 psi
    2. Cut-in at 100 psi
    3. Cut-out at 125 psi
    4. Cut-out 20 psi above cut-in

21. When does an air dryer expel the moisture it has collected?

    1. When the compressor reaches cut-out
    2. Each time the pedal is released
    3. Only when the engine is shut off
    4. When the low-air warning activates

22. How else can you find a chamber's size if no records are available?

    1. Check the colour of the air line
    2. Clamp diameter or size markings
    3. Read the markings on the tire sidewall
    4. Count the folds in the diaphragm

23. What penalties can follow for driving a vehicle that does not comply with the law?

    1. Only a written warning
    2. Only demerit points
    3. Only a CVOR audit
    4. From fines up to impoundment

24. If the trailer breaks away, at what supply-line pressure does the trailer supply valve close by itself?

    1. Between 60 and 80 psi
    2. Only at 0 psi
    3. Between 20 and 45 psi
    4. Between 100 and 120 psi

25. Which habit helps keep brake temperatures down?

    1. Leaving a safe following distance
    2. Coasting in neutral down long grades
    3. Riding the brake lightly on all hills
    4. Braking hard and late at every stop